Best Calculator Apps in 2026: 9 Apps Compared

PCalc is widely regarded as the best calculator for iPhone, iPad, Mac and Apple Watch, and the feature list backs that up. It handles standard, scientific and programmer calculations, supports RPN entry for engineers, and includes unit and currency conversions that you can edit and share. Layouts and themes adapt it to simple arithmetic or lab work.

A free Lite version lets you try it, and the full edition costs $9.99. That one-time price is fair for the depth on offer, but Android and Windows users are left out entirely. If you live in the Apple ecosystem and want one calculator for everything, PCalc is the pick.

Soulver works like a notepad that calculates. You type lines such as lunch costs and tax rates in plain words, and answers appear in a column beside your text. Variables, subtotals, line references and unit conversions make it ideal for budgets, quotes, trip costs and multi-step problems that a button calculator hides. The vendor page confirms a $39 price and a 60-day trial that does not charge automatically.

The limits are platform and scope. Soulver runs on Mac, iPhone and iPad only, and it does not graph functions. If your work is thinking through numbers in steps, with notes attached, Soulver is unmatched. If you need graphs or Android support, Desmos or HiPER will fit better.

Calcbot is a clean, friendly calculator with a history tape that actually helps. You can see past calculations, reuse them in new ones, and convert units without switching apps. It works on iPhone, iPad and Apple Watch, which makes it handy for quick checks away from a desk. The base app is free, with a Pro upgrade for extra features.

It is not a graphing calculator and not an engineering workstation, so students who need plots should look at Desmos. For everyday math, conversions and a tape you can trust, Calcbot is a strong free pick for Apple users.

Desmos Graphing Calculator is free on the web, iPhone and Android, and it is the standard classroom graphing tool for good reason. You can plot many expressions at once, add sliders to explore how parameters change a graph, build tables, and find points of interest such as maxima, minima and intersections by tapping the curve. It works offline in the app, which helps in exams and classrooms without reliable internet.

The trade-off is focus. Desmos graphs beautifully, but it is not a budgeting notepad like Soulver or a finance calculator. For students, teachers and anyone learning functions, it is the best free graphing app here. For quick arithmetic, a simpler calculator will be faster.

Desmos Scientific Calculator uses the same fast math engine as the graphing app, in a streamlined form for times when you do not need a graph. It covers arithmetic, roots, logs, absolute value, percentages, trigonometry, statistics and combinations, and it lets you define and evaluate your own functions. Past expressions stay visible, and the answer key updates if you change an earlier line.

If you need graphs, use the Desmos Graphing Calculator instead, since this version does not plot. If you need a free, reliable scientific calculator for homework or exams, this is the simplest strong pick in the list, with no ads and no paywall.

HiPER Calculator is the most capable scientific calculator for Android in this list. The free version covers scientific functions, symbolic algebra, graphing, equation solving, integrals and derivatives, with up to 100 digits of precision in its calculations. Layouts adapt to pocket, compact and expanded screens, and themes and multiline display help on tablets.

The interface packs a lot onto one screen, which can overwhelm someone who only needs basic arithmetic. The Pro version, listed at $4.99, removes ads and adds extra features. For Android students and engineers who want a serious calculator in their pocket, HiPER is the pick.

GeoGebra Graphing Calculator combines graphing, geometry, algebra and spreadsheets in a free app used widely in schools. You can plot functions, build geometric constructions, explore sliders and share work with a class. It runs on the web, iPhone, Android and desktop, which makes it easy to move between home and classroom.

The breadth is also the drawback. GeoGebra asks more of a new user than Desmos, and it is overkill for a tip calculation. For teachers, students and self-learners who want geometry alongside graphs, it is the richest free option here. For simple math, pick a lighter calculator.

RealCalc mimics a traditional scientific calculator, which is exactly why many Android users love it. Buttons sit where your fingers expect them, history and memory work as they should, and binary, octal and hexadecimal modes help programmers. The free version covers the core scientific set, with a paid upgrade for extra features.

There is no iOS version, so Apple users should pick PCalc or Desmos instead. The design is plain, but for Android users who want a no-fuss scientific calculator that feels like hardware, RealCalc is a dependable free pick.

Microsoft Calculator ships free with Windows and covers more than most people expect. Standard, scientific, programmer and graphing modes sit in one app, alongside date calculation and unit and currency conversions. History keeps past calculations visible, and the graphing mode plots equations for students.

It is a Windows product first, so phone users should look at the mobile apps above. For Windows users who want a capable calculator without installing anything, it is already there and it costs nothing. That makes it the default pick on Windows, with PCalc or HiPER as upgrades on other platforms.